Inductor-capacitor voltage-controlled oscillator with common-mode noise suppression
AssigneeApple Inc.
InventorOmar E Elaasar
Life of this patent
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Abstract
This disclosure is directed to a Voltage-Controlled Oscillator (VCO) with reduced phase noise compared to other VCOs. The VCO may include a first cell and a second cell separated by common-mode (CM) isolation circuitry. The first cell and the second cell may each include a portion of the CM noise of the VCO. Moreover, gate terminals of switches of the first cell and the second cell may be cross-coupled to drain terminals of the switches of the second cell and the first cell respectively. An interdependency of voltages of the first cell and the second cell may reduce an amplitude of the respective portions of the CM noise on the first cell and the second cell.
Claims20
An electronic device comprising:
- an antenna;
- and
- a voltage-controlled oscillator (VCO) coupled to the antenna, the VCO comprising
- a first switch,
- a second switch comprising a second gate terminal and a second drain terminal,
- a first inductor-capacitor tank circuit coupled to the first switch and the second switch,
- a second inductor-capacitor tank circuit coupled to the first inductor-capacitor tank circuit,
- a third switch comprising a third gate terminal and a third drain terminal, the third drain terminal coupled to the second inductor-capacitor tank circuit and directly coupled to the second gate terminal, and the third gate terminal directly coupled to the second drain terminal, and
- a fourth switch coupled to the second inductor-capacitor tank circuit and the first switch.
A transceiver comprising:
- amplification circuitry;
- and
- voltage-controlled oscillator (VCO) coupled to the amplification circuitry, the VCO comprising:
- a first switch;
- a second switch comprising a second gate terminal and a second drain terminal;
- a third switch comprising a third gate terminal and a third drain terminal, the third drain terminal directly coupled to the second gate terminal, and the third gate terminal directly coupled to the second drain terminal;
- a fourth switch;
- a first inductor-capacitor tank circuit coupled to the first switch and the second switch;
- and
- a second inductor-capacitor tank circuit coupled to third switch, the fourth switch, and the first inductor-capacitor tank circuit.
A voltage-controlled oscillator (VCO) comprising
- a first switch,
- a second switch comprising a second gate terminal and a second drain terminal,
- a first inductor-capacitor tank circuit coupled to the first switch and the second switch,
- a second inductor-capacitor tank circuit coupled to the first inductor-capacitor tank circuit,
- a third switch comprising a third gate terminal and a third drain terminal, the third drain terminal coupled to the second inductor-capacitor tank circuit and directly coupled to the second gate terminal, and the third gate terminal directly coupled to the second drain terminal, and
- a fourth switch coupled to the second inductor-capacitor tank circuit and the first switch.
Dependencies are inferred from the claim text.